stanley sliding doors - refitting new replacement?

My husband is - how shall I say it? not very competent when it comes to diy. He has painted my replacement door, but now it sits in the garage because he has no idea how to fit it up in place of the old twisted one. I was going to mind about the new door not entirely matching the other door, but now I am so desperate to get the door in place, I would do it myself if I were able, but I am small and disabled, help someone. He says he knows the new door should have runners on the ends and he would not know where to get them or how to fix them. Help pleeeeze.